MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 542)

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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.7.3 M code output function
The "M code output function" is used to command sub work (clamping, drill rotation,
tool replacement, etc.) related to the positioning data being executed.
When the M code ON signal (X4, X5, X6, X7) is turned ON during positioning
execution, a No. called the M code is stored in " Md.25 Valid M code".
These " Md.25 Valid M code" are read from the PLC CPU, and used to command
auxiliary work. M codes can be set for each positioning data. (Set in setting item
" Da.10 M code" of the positioning data.)
The timing for outputting (storing) the M codes can also be set in the "M code output
function".
The details shown below explain about the "M code output function".
[1] M code ON signal output timing
[2] M code OFF request
[3] Precautions during control
[4] Setting the M code output function
[5] Reading M codes
[1] M code ON signal output timing
The timing for outputting (storing) the M codes can be set in the "M code output
function". (The M code is stored in " Md.25 Valid M code" when the M code ON
signal is turned ON.)
The following shows the two types of timing for outputting M codes: the "WITH"
mode and the "AFTER" mode.
(1) WITH mode
The M code ON signal (X4, X5, X6, X7) is turned ON at the positioning
start, and the M code is stored in " Md.25 Valid M code".
Md. 25 Valid M code
Cd. 7 M code OFF request
Positioning start signal
BUSY signal
M code ON signal
Positioning
01 00
m1 m2
m1 and m2 indicate set M codes.
Dwell time V
t
1 0 1 0 0 0
OFF
OFF
OFF
ON
ON
Da. 1 Operation pattern
[XC, XD, XE, XF]
[Y10, Y11, Y12, Y13]
[X4, X5, X6, X7]
ON
Fig. 12.38 M code ON/OFF timing (WITH mode)